[caffe2][be] migrate global static initializer SingletonUndefinedTensor #128828
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Summary: Caffe2 lib has 200+ global static initializer usage, which are papar-cut reference to startup perf. Detail in this post https://fb.workplace.com/groups/arglassesperf/permalink/623909116287154.
Test Plan: CI
Differential Revision: D58643691
@diff-train-skip-merge